Yahoo Answers: Answers and Comments for Two F3 Maths Problems [數學]
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enUS
Mon, 13 Apr 2015 12:07:51 +0000
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Yahoo Answers: Answers and Comments for Two F3 Maths Problems [數學]
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https://answers.yahoo.com/question/index?qid=20150413000051KK00036
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From freda: From Natelie's 意見: the coordinate of C =(1...
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Sun, 19 Apr 2015 16:45:33 +0000
From Natelie's 意見: the coordinate of C =(1,3) & D=(4,4)
2(b) Find the equation of OD.
(y0) / (x0) = (40) / (40)
y/x= 4/4
y=x
2(c) Suppose CE:AE=1:k
(1) Find the coordinate of E in terms of k.
C=(1,3) & A(8,0)
E=( (1k+8) / (1+k) , (3k+0) / (1+k) )
E is on the line OD, so subsitute the x & y coordinate into the equation of OD
y=x
(1k+8) /(1+k) =3k / (1+k)
1k+8 = 3k
2k=8
k=4 //

From NATALIE: 2a) The coordinates of C is:
[(2+0)/2 , (6...
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Mon, 13 Apr 2015 19:37:24 +0000
2a) The coordinates of C is:
[(2+0)/2 , (6+0)/2]
=(1,3)
The coordinates of D is:
[(8x1)+(2x2)/(2+1) , (0x1)+(6x2)/(2+1)]
=[(8+4)/3 , (0+12)/3]
=(4,4)